Sanlitun is a good location, around 500m from Hooters and the Den at the south end, and around 800 or 900 metres from Paddy O'shea's at the north end. It is pure coincidence that each of the venues mentioned sells draught Guinness...
Anyone looking for accommodation try asiarooms.com, I used them the first couple of times I went to Beijing and they seem reasonably cheap.
The official site is saying tickets are limited at £60 each and have to be sent to a UK address? It also says that there is no other way to obtain the tickets.
There is a Chinese site advertising tickets for this, my stepdaughter has already been in touch with them.
Anyway, I'm on my way on the 21st, arriving in Beijing early on the 22nd and I'll be staying within walking distance of Sanlitun on Dongziemenwei, might just possibly take a stroll down Sanlitun, I'd like to see the look on the manager's face at Paddy O'Shea's if the place was overrun by Blues, he's an Irish Rag!